181 citations · 775 across the 35 of their papers we have counts for
9 papers · 1 filter
Hydrodynamical Velocity Fields in Planetary Nebulae
W. Steffen, G. Garcia-Segura, N. Koning
Based on axi-symmetric hydrodynamical simulations and 3D reconstructions with Shape, we investigate the kinematic signatures of deviations from homologous ("Hubble-type") outflows…
The 'Hubble-type' outflows from the high excitation, poly-polar planetary nebula NGC 6302
J. Meaburn, J. A. Lopez, W. Steffen +2
Spatially resolved profiles of the Halpha and [NII] lines have been obtained at unprecendented signal--to--noise ratios over the outflowing lobes of the high--excitation, poly--pol…
FLIERs as stagnation knots from post-AGB winds with polar momentum deficiency
W. Steffen, J. A. Lopez, A. Lim
We present an alternative model for the formation of fast low-ionization emission regions (FLIERs) in planetary nebulae that is able to account for many of their attendant characte…
FLIERs as stagnation knots from partially collimated outflows
Wolfgang Steffen, Jose Alberto Lopez
We propose a new model for the formation of fast, low-ionization emission regions (FLIERs) in planetary nebulae that is able to account for many of their attendant characteristics…
Jets and the shaping of the giant bipolar envelope of the planetary nebula KjPn 8
W. Steffen, A. Lopez
A hydrodynamic model involving cooling gas in the stagnation region of a collimated outflow is proposed for the formation of the giant parsec-scale bipolar envelope that surrounds…
Photo-evaporation of clumps in Planetary Nebulae
Garrelt Mellema, Alejandro C. Raga, Jorge Canto +4
We study the evolution of dense neutral clumps located in the outer parts of planetary nebulae. These clumps will be photo-ionized by the ionizing radiation from the central star a…